Pneumatic hammer.



PATENTED SEPT 17, 1907.

J. BUYER. PNEUMATIC HAMMER.

APPLICATION FILED AUG.10,1905.

- m.- seds're."

- Original application filed September 26,1899, Serial No. 731,720. Divided and this application filed August 10, 1905.

" 8ar1alNo.273,616.

UNITED STATES rurnnr OFFICE.

-JOSEPH BoYER, 0F DETROIT, MICHIGAN, ASSIGNOR TO CHICAGO PNEUMATIC TOOL COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF NEW JERSEY.

PNEUMATIC HAMMER.

T Zbdll whom it may concern Be itknown that I, .losnrn BOYER, a citizen of the United States, formerly residing at St. Louis, Missouri, but now residing at Detroit, Wayne county, Michigan, have invented certain new and useful Improvements in Pneumaticiliammers, of which the following is a specification.

My invention relates to pneumatic hammers, and

Jr'n ore particularly-means for holding the working tool,

such as a chisel or rivet set, to the forward or. outer end of the cylinder or barrel of the hammer.

W The object of my invention is to provide a simple and efficient device or means of, this character and at the same time make provision for a relative limited movement of one of such parts with respect to the other.

According to the within described embodiment of my invention, such deyice consists of a clip of spring metal suchas thin sheet steel, arranged to engage orgrip one of said parts (in the present instance the cylinder) Without relative longitudinal movement thereon, but

arranged to loosely engage the other part (in the present I instance the working tool or rivet set) in such manner as that'the latter wilI liave a relative movement longif tudinally. The clip is so constructed as to readily perthe removal of the working tool-or the substitution of'another one whenever desired, but such clip when in place is arranged to securely connect the working tool to the cylinder and also permit the limited longitudinal movement referred to.

In the accompanying diawing, Figure l is a side elevation of'a pneumatic hammer withthe forward end thereof in section to illustrate my spring clip and its cooperation with the forward end of the cylinder and the working tool; and Fig. 2 a perspective view of the clip. 35

Theparticular hammer herein illustrated is of the type'comin'only known as the Boyer long stroke ham: mer, but it is obvious that my invention'is' not to be limited to any particular type or makeof hammer, but that it may be applied to hammers of different construction and of different make, without departing from the spirit and scope ofmy invention and claims.

Referring to the drawing, the hammer therein. ill ustrated comprises a cylinder or barrel A having secured to its rearward end the usual grasping-handle B. The particular type of hammer herein shown happens to v have a nose-piece E secured to the front of the cylinder,

but so far as my invention is concerned, such nose-piece forms in efiect a part of the cylinder itself and will so be considcredin the subsequent description and in the claims following. As usual, the cylinder is provided at its front end with an opening, which is arranged to receive the shank of a working tool which, in the present illustration, isa rivet set F. I

For the purpose of detachably connecting the work- Specification of Letters Patent.

Patented Sept. 17, 1907.

ing tool or rivet set to the cylinder and hold it against displacement, I employ the clip G which is shown in section in Fig. 1, and in perspective in Fig. 2. This clip may be made of suitable spring metal, such as thin sheet steel rolled in circular form but open or split at one side so as to partially surround the cylinder and working tool. The clip is provided at its opposite ends and at opposite sides with pairs of inturned flanges g g which are arranged to engage circumferential grooves on the cylinder and working tool respectivelyl 'In the present instance and by preference, the front end of the cylinder is provided with an annular rearwardly facing shoulder formed by a circumferential groove G to receive one pair of the flanges, say the pair 9, and of a width so as to be stationarily held-to the cylinder, asagainst longitudinal movement, one with respect to the other. In order to permit the working tool to have a longitudinal movement to a limited extent with respect to the cylinder, I provide the working tool with a cor.

responding annular forwardly facing shoulder formed by a circumferential groove Gr which is relatively wider and adapted to receive the other pair of flanges g, with the result that the working tool is permitted to move longitudinally with respect to the cylinderto a limited extent, that is the working tool is permitted to move outwardly until its flange or shoulder f contacts the inturned flanges g, the? degree of such movement being determined by the width of the circumferential groove G When the working tool or rivet set is to be removed from or inserted into the hammer the ends of the clip G are sprung apart in suitable manner, as by means of a pair of pliers, whereupon the shoulder f upon I the rivet set may readily pass the flanges upon the clip, as such set is Withdrawn or inserted.

By the use of my invention, the working tool or rivet set is not only properly held at the front of the cylinder in a detachable manner by the employment of a simple and efiicient device, but is permitted to have a longitudinal movement or play with respect to the cylinder, with the result that the clip is relieved of the force and jar of the blow delivered by the hammering piston to the rivet set. Moreover, this limited movement or play of the rivet set permits of the operation of the automatic throttle valve forming a part of the subject matter of the original. application, of which the present is a division, which automatic valve is located at the rearward end of the cylinder and arranged to be automatically opened by the act of pressing the tool orrivet set to the work.

Although I contemplate using my invention wherever-applicable, the same has particular application to what are generally known as riveting hammers, in

which it is desirable, if not required, that the rivet set shall he held in detachable manner to the cylinder or body of the tool or hammer proper so as-to prevent the rivet set from dropping out or from being shot out, the shank of such rivet set in this type of hammer, as illustrated in the d swing, being such as to close the bore or opening inthe front end of the cylinder.

I claim:

1. In a pneumatic hammer, the combination, with the cylinder thereof and with a removable working tool insertible in the front end of such cylinder, of a spring clip carried by one of said parts, partially surrounding said parts-and having a shoulder or detent adapted to cooperate with a shoulder or detentv on the other of said parts and hold them together and permitting a limited longitudinal movement of one with respect to the other; substantially as described.

2. In a pneumatic hammer, the combination, with the cylinder thcreof'and with a removable working tool insertible in the front endof such cylinder, said parts having grooves at their adjacent ends, of a spring clip hav ing means arranged to engage said grooves, one of said grooves being relatively wider to permit limited reciprocation of one of said parts with respect to the other; sub stantially as described:

3. In a pneumatic hammer, the combination, with the cylinder thereof and with a removable working tool in sertible in the front end of such cylinder, of a spring clip coiiperating with said parts to hold them together and provided at its ends with inturn'ed flanges, one of said parts having aicircumferential groove of a width to re ceive and stationarilyuhold the ,flange at one end of the clip, and the otherot said parts having a relatively wide circumferential groove to receive the flange at -the other end of the clip, thereby permitting limited reciprocation of the tool relatively to the cylinder; substantially as described. 4i In a pneumatic hammer, the combination, with the cylinder thereof and with a removable working tool insertlble in the front end of such cylinder, of a spring clip 'coiiperating with said parts to hbld them together and provided at its ends with inturned flanges, the cylin- (101 having a groove of a width to receive and stationarily hold the flange at the rear endof the clip and the working tool having a wide groove to receive the flange at the front end of the clip and permit limited reciprocation of the tool relatively to the cylinder; substantially as described. I I 5. In apneumatlc hammer, the combination, with'the cylinder thereof and with a removable working tool in serti'ble in. the front end of such cylinder, of aspring clip'coiiperating with said parts to detachably connect the working tool with the cylinder, the. clip being open on one side and provided at each end with a pair of opposite and inturned flanges, the cylinder having a groove to receive the pair of flanges at one end of the clip and the described.

6. In a pneumatic hammer, the combination with the cylinder or body of the tool provided near itsftont end rounding said parts and provided at its front and rear ends with inturned flanges engaging said annular shoulders to prevent displacement of the'working tool, substantially as described.

7. In a pneumatic hammer, the. combination with the cylinder or body of the tool provided with a circumferential groove near its front end, and the removable working tool havinga shank inserted in the front end of said cylinder, and provided with' a forwardly facing annular shoulder, of a spring clip surrounding said parts and pro-. vided at its front and rear ends with inturned flanges engaging said groove and annular shoulder, respectively, :to prevent displacement of the working tool; substantially as described.

S. In a pneumatic hammer, the combination with the cylinder or body ofthe tool provided with a circumferential groove near its front end, and-theremovable working tool having the shank inserted in the front end of. said body and provided also with a circumferential groove, of a spring clip partially surrounding said parts and provided at its front and rear ends with inturned flanges engaging said grooves; substantially as described.

9. In a pneumatic hammer, the combination with the cylinder or body' of the tool provided near its front end with a circumferential groove, and the removable working tool having the shank inserted in the front end of said body and provided also with a wide circumferential groove adjacent the front end of said body, of a spring clip partially surrounding said parts and provided at its front and rear ends with inturned flanges engaging said grooves, the relatively wide groove of the working tool permitting limited reciprocation of "the latter relatively to the spring clip and body of the tool ;-substantially as described.

10. In a'pneumatic hammer, the combination with the cylinder mabody of the tool having'its front end E provided with a circumferential groove, and the removable working tool having the shank F inserted in the central bore in the said front end of the body of the tool, and

provided also "with the wide circumferential groove adjacent the front end of said body, of the spring clip G partially surrounding said parts and provided-at its front and rear ends with the inturned flanges engaging said grooves; substantially as described.

11. In a pneumatic hammer; the combination, with the cylinder or body of the tool formed at its front end to receive the shank of the working tool and provided with the circumferential groove G of the Working tool provided with said shank andthe circumferential groove G'-, and the clip G provided at its opposite ends with the inturned flanges engaging the grooves G and G respectively; substantially as described.

' JOSEPH BOYER.

Witnesses:

anvlm Mncacnnr, V. V. Dawson; 

